Backpack with rear tunnel



FIG. 1 is an upper rear perspective of the baskpack with ergonomical tubular shaped tunnel on the backside showing our new design;

FIG. 2 is a front perspective side view thereof;

FIG. 3 is a back view thereof;

FIG. 4 is a side view thereof; and,

FIG. 5 is a front view thereof.

The broken lines shown thoughout the views are intended to represent stitching. 

The ornamental design for backpack with rear tunnel, as shown and described. 